Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/18/2021   23:06:38   (  -0.02,-137.19) (  -0.99,-141.43)  483.51                80
 10/19/2021   22:50:20   (  -0.03,-137.19) (   0.03,-136.84)   39.77                80
 10/22/2021   10:50:08   (   0.03,-137.18) (   0.10,-137.41)   26.88                80
 10/23/2021   10:33:49   (   0.03,-137.17) (  -0.93,-132.82)  495.73                80
 10/24/2021   22:52:45   (  -0.02,-137.15) (  -0.20,-138.04)  100.40                80
 10/25/2021   22:36:27   (  -0.02,-137.14) (   0.82,-133.44)  421.68                80
 10/27/2021   10:55:13   (   0.02,-137.12) (   0.33,-138.61)  169.43                80
 10/28/2021   10:38:55   (   0.02,-137.10) (  -0.70,-134.02)  352.19                80
 10/29/2021   22:57:50   (  -0.01,-137.07) (  -0.48,-139.22)  245.26                80
 10/30/2021   22:41:32   (  -0.01,-137.05) (   0.54,-134.63)  276.09                80